Since I wrote this, I’ve had the chance to explore more of Italy’s hidden gems, and I’m reminded of the importance of mastering the art of navigation in cities like Venice. As I mentioned in my guide to navigating the City of Canals with kids, where my colleague Elena expertly outlined the perfect winter getaway for families, skiing with kids in Bormio is an excellent option to consider.
As I delve deeper into the subterranean world of Naples, I’m reminded of the mysterious village of Calcata Vecchia, which my colleague Luca has beautifully explored in his article, The Village That Defied Time. Like Calcata Vecchia, the experience of uncovering the ancient secrets of Bevagna, Umbria, which I wrote about in my guide to uncovering the ancient secrets of Bevagna, Umbria, is one that I’ll never forget.
The Foundation: The Greek Tufa Quarries#
Update: I’ve since written a guide to the unique aspect of geography in Pitigliano, which I mentioned in The Town Carved from Stone. For those looking to explore more of Italy’s unique landscapes by car, my colleague Marco has a wonderful guide to iconic italian road trips.
Since I wrote about the hidden pasta passages of Bologna in my guide, Bologna’s Secret Pasta Passages, I’ve been reminded of the thrill of discovery that comes with exploring Italy’s hidden subterranean worlds. My colleague Marco has a wonderful guide to traveling through the Lucanian Dolomites, and I must say, the same sense of adventure that drives him through those rugged landscapes is what draws me to these historic passages.
Napoli Sotterranea: The Heart of the Underworld#
The most iconic entry point is Napoli Sotterranea, located in the heart of the historic center at Piazza San Gaetano, 68. You enter through a nondescript door next to the Basilica of San Paolo Maggiore, and suddenly, the temperature drops, the city noise vanishes, and you are transported back in time.
The Aqueduct and the Monaciello#
For centuries, these tunnels carried fresh water from the Serino springs to the homes of Neapolitans. Access was gained through private wells. This gave rise to one of my favorite local legends: the Monaciello (the Little Monk). These were actually the water-carriers who, covered in soot and mud, would climb up the well shafts into people’s homes. If they were paid well, they left gifts; if not, they played tricks. Even today, if a Neapolitan loses their keys, they might blame the Monaciello.
The Scars of World War II#
During the 1940s, these ancient Greek cisterns took on a new, somber life. As the most bombed city in Italy, Naples turned to its ancestors for protection. The aqueducts were drained and converted into air-raid shelters for thousands of citizens.
Hidden behind these walls is a collection of heartbreaking relics from that era. You will see rusted iron bedframes, children’s toys carved from stone, and graffiti on the walls—names of lovers, drawings of planes, and prayers for survival. Standing in a room where five hundred people once huddled in the dark while sirens wailed above is a profound, humbling experience that no history book can replicate.
The Roman Theater: Hidden in a Living Room#
One of the most extraordinary secrets of Naples is the Teatro Romano di Neapolis. This is where the Emperor Nero performed, famously refusing to stop singing even when an earthquake struck the city.
But here is the “Alessandro” tip: you won’t find this theater by looking for a grand monument. It is hidden within a traditional Neapolitan basso—a ground-floor apartment. To access it, you follow your guide into a private home on Via San Cinquegrana. The resident pulls back a rug, lifts a trapdoor under a bed, and suddenly, you are descending into the brickwork of a 1st-century Roman theater. Seeing the ancient opus reticulatum walls supporting a modern kitchen is the ultimate testament to how Naples lives with its history, not just beside it.
The Bourbon Tunnel: An Underground Highway#
If the Greek tunnels are about water and the Roman tunnels are about art, the Galleria Borbonica (Bourbon Tunnel) is about power and escape. Commissioned in 1853 by King Ferdinand II of Bourbon, this massive tunnel was intended to be a military escape route from the Royal Palace to the barracks near the sea.
Entering from Via Domenico Morelli, you find yourself in a space that feels like a subterranean cathedral. During the Cold War, this area was used as a government impound lot. Today, it is a surreal graveyard of vintage 1940s and 50s cars and motorcycles, all covered in a fine layer of tufa dust. It feels like a movie set, yet every rusted Vespa tells a story of a city that has survived through grit and ingenuity.
The Catacombs of San Gennaro: A Journey into Faith#
For those who want to see the spiritual side of the underground, you must head to the Rione Sanità district. The Catacombs of San Gennaro are the most important in Southern Italy.
Unlike the cramped, narrow catacombs of Rome, these are vast, airy spaces carved into the hillside. They feature stunning 2nd-century frescoes and mosaics. What makes this site special is the social impact; it is managed by La Paranza, a cooperative of local youths who have revitalized their neighborhood through heritage. It’s a beautiful example of how ancient history can provide a future for the modern Neapolitan youth.
Alessandro’s Insider Advice for the Modern Traveler#
How to Get There and Booking Secrets#
- Napoli Sotterranea (Piazza San Gaetano): This is the most popular tour. I highly recommend booking online in advance, especially during the spring and autumn months. If the main line is too long, look for the “Neapolis Sotterrata” entrance beneath the Church of San Lorenzo Maggiore nearby—it offers an incredible look at the ancient Roman macellum (market).
- Galleria Borbonica: They offer different “levels” of tours. If you are adventurous, take the “Speleo Tour,” where they provide you with a helmet and headlamp to explore flooded tunnels by raft.
- Catacombs: Your ticket for San Gennaro also includes entry to the Catacombs of San Gaudioso. You can walk between them, but be prepared for the hills!
Best Time to Visit#
The tunnels maintain a constant temperature of about 16–17°C (61°F) year-round. This makes them the perfect escape from the sweltering Neapolitan summer sun in July or a dry refuge during a rainy November afternoon.
What to Wear#
Comfortable walking shoes are non-negotiable. The ground can be uneven and occasionally damp. If you are claustrophobic, the “narrow passage” part of the Napoli Sotterranea tour (the candle-lit aqueduct) is optional—just let your guide know, and you can take the bypass.
Where to Eat: A Reward for the Explorer#
After hours spent in the cool dark of the earth, you will emerge hungry. Stay in the historic center and head to Antica Pizzeria ai Sette Soldi on Via San Gregorio Armeno. While everyone else is waiting three hours for Sorbillo, you can enjoy a perfect, charred Margherita here among the locals.
If you want something more substantial, find Trattoria Da Carmine on Via dei Tribunali. Order the Pasta e Patate con Provola—it is creamy, smoky, and exactly the kind of “soul food” you need after a journey through time.
Final Reflections#
Naples is not a city you simply visit; it is a city you feel. Its history is not locked away in sterile museum cases; it is under your feet, behind the walls of your apartment, and carved into the very stone of the mountains.
As you walk back out into the sunlight of the Piazza San Gaetano, take a moment to look at the cobblestones. Remember that beneath them lies a labyrinth that has protected, provided for, and defined this city for millennia. This place has witnessed centuries of change, yet it remains stubbornly, beautifully itself.
Until our next journey through time, buon viaggio.
Since writing this, our team’s resident foodie expert, Giulia, explored the lush region of Umbria, uncovering its most hidden gems on a culinary journey. For those who want to delve deeper into the flavors and aromas of this Italian gem, I recommend checking out Giulia’s in-depth guide to Savoring Spring in Umbria: A Food and Wine Journey Through Italy’s Green Heart.